Oops! I Slept My Rival's Billionaire Dad

Lily Cole has been quietly in love with the same man for ten years. He and his new girlfriend humiliate her in front of everyone, so she goes out and drinks. She ends up in the wrong hotel room, with an older man named William Wilson, and thinks she has hired an escort. A month later she is pregnant. While she is still panicking about it, William turns up prepared to marry her, with a billion dollars in dowry attached to the offer. Lily has no interest in becoming somebody's stepmother and tries to get away from the whole arrangement. That is when she learns who he actually is: not only a billionaire, but the father of the man she cannot stand, the rival who has been making her life difficult. Other people have their own fathers backing them. Lily now has her rival's father standing on her side of every fight.